Intellisystem IT-7301-PC, User Manual

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5
4.2 Front/rear panels of an independent casing

IT-7301-PC front panel
：
Front panels of IT-7301-PC
POWER
：
Power supply indicator lamp. Constantly lightening after the machine is turned on.
E1 LOF
：
Alarm indicator lamp for input signal out-of-frame in E1 line. Constantly lightening indicates the
alarm with local device; flash indicates the alarm with opposite device. Alarm status of opposite
device can be detected only at framing mode.
E1 LOS
：
Alarm indicator lamp for code missing in E1 line. Constantly lightening indicates the alarm with local
device.
FO LOF
：
Alarm indicator lamp of input signal out-of-frame in optic line. Constantly lightening indicates the
alarm with local device; flash indicates the alarm with opposite device. Alarm status of opposite
device can be detected only at framing mode.
FO LOS
：
Alarm indicator lamp for code missing in optic line. Constantly lightening indicates the alarm with
local device.
LOOP
：
Indicator lamp of loopback test status. When local device is at a loopback status, the lamp is
constantly lightening; when opposite device is at a loopback status, the lamp flashes. When local
device is not at a framing mode, it is unable to detect whether opposite device is at a loopback test
status.
PTOK/CRC
：
Indicator lamp of Pseudo-random code test. When the device is at a loopback status,
pseudo-random code test can be made. If this lamp is constantly lightening, it indicates that Pseudo-random
code passes the test.

IT-7301-PC /AC rear panel
：
IT-7301-PC/AC Rear Panel Schematic
220V AC
：
AC power jack.
OFF ON
：
Power switch. When the ON button is pressed down, the power supply is turned on.
E1-
75Ω TX ／
RX
： Receiving/sending jack of 75ΩBNC interface in E1.
E1-
120Ω ： Jack of 120Ω RJ45 interface in E1.
TX RX: Receiving/sending jack of optical fiber, with TX as the sending terminal and RX as the receiving
terminal.
220V AC
OFF ON
TX RX
E1-75?
TX RX
E1-120 ?
220V AC
OFF ON
TX RX TX RX
E1-75?
TX RX
E1-120 ?
E1-75?
TX RX
E1-120 ?
1 2 3 4 5 6 7 8
ON
P
A
T
T
O
F
F
O
F
F
O
F
F
O
F
F
ON
R
L
O
O
P
D
L
O
O
P
L
L
O
O
P
T
IM
_
M
O
D
1
T
IM
_
M
O
D
0
T
IM
_
M
A
S
K